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One-ellipse effect preceding SDW in … High-resolution ARPES study of FeSe superconductors 著者 PHAN Giao Ngoc number 82 学位授与機関 Tohoku University 学位授与番号理博第3147号 Two recent ARPES studies have found a gap in single-layer FeSe/STO, which closes at 65 K and suggests a possible record high superconducting transition temperature (T c) of 65 K for FeHTSs FeSeZhou2 (); FeSeTan (); or at least, it is the pair-formation temperature record, if the superconducting transition there is a two dimensional Berezinskii-Kosterlitz-Thouless (BKT) type. 2021-02-17 High‐temperature superconductivity at the FeSe/SrTiO3 interface Yuan‐Yuan Xiang, Fa wang, DA Wang, Qiang‐Hua Wang, and Dong‐Hai Lee. Phys. Rev. B 86, 134508 (2012) Atomic and electronic structures of FeSe monolayer and bilayer thin films on SrTiO3(001): First‐principles study Kai … ARPES on Electronic Structure and Superconductivity of FeSe /SrTiO 3 Films Xingjiang ZHOU (周兴江) National Lab for Superconductivity Institute of Physics, Chinese Academy of Sciences, Beijing, China Strong Correlations and Unconventional Superconductivity: Towards a Conceptual Framework ， 2014/09/22--26, KITP, Santa Barbara spectroscopy (XPS) and angle-resolved photoemission spectroscopy (ARPES) on fresh surfaces. FeSe PLD growth protocols were ﬁne-tuned by optimizing target-to-substrate distance d and ablation frequency, atomically ﬂat terraces with unit-cell step heights are obtained, overcoming the spiral morphology often observed by others. the low temperature Fermi surface of FeSe as experimentally determined by ARPES consists of one ellipti-cal hole pocket and one orthogonally-oriented peanut-shaped electron pocket. ARPES Studies of Monolayer FeSe on MBE Controlled Titanate Heterostructures.

the low temperature Fermi surface of FeSe as experimentally determined by ARPES consists of one ellipti-cal hole pocket and one orthogonally-oriented peanut-shaped electron pocket. ARPES on Electronic Structure and Superconductivity of FeSe /SrTiO 3 Films Xingjiang ZHOU (周兴江) National Lab for Superconductivity Institute of Physics, Chinese Academy of Sciences, Beijing, China Strong Correlations and Unconventional Superconductivity: Towards a Conceptual Framework ， 2014/09/22--26, KITP, Santa Barbara spectroscopy (XPS) and angle-resolved photoemission spectroscopy (ARPES) on fresh surfaces. FeSe PLD growth protocols were ﬁne-tuned by optimizing target-to-substrate distance d and ablation frequency, atomically ﬂat terraces with unit-cell step heights are obtained, overcoming the spiral morphology often observed by others. We report results on epitaxial FeSe thin films grown by pulsed laser deposition (PLD) on CaF2 (001) substrates as obtained by exploiting the advantages of an all-in-situ ultra-high vacuum (UHV) laboratory allowing for direct high-resolution surface analysis by scanning tunnelling microscopy (STM), synchrotron radiation X-ray photoelectron spectroscopy (XPS) and angle-resolved photoemission spectroscopy … 2017-03-01 2017-05-05 2019-10-02 2017-06-09 Enabled by an angle-resolved photoemission spectroscopy beamline with a highly focused beam spot (nano-ARPES), we identify clear stripelike orthorhombic domains in FeSe with a length scale of 2012-07-03 We have revealed the existence of a novel electronic state in an highly unconventional multiband superconductor, FeSe, from the evolution of its electronic structure from the high-temperature tetragonal phase into the electronic nematic phase using angle resolved photoemission spectroscopy (ARPES). Bulk FeSe is an iron-based superconductor that has a maximum Tc of 8K.

We show, using ARPES selection rules, that the intensity oscillation is a signature of band inversion indicating a change in the parity going from $\Gamma$ to Z. Thus we provide the first direct evidence for a topologically non-trivial bulk band structure that supports protected surface states. ARPES has provided suggestions that the N phase of the single-layer FeSe/SrTiO 3 film may be magnetic and the low-temperature form of the multi-layer FeSe/SrTiO 3 films may be in the spin-density-wave state . Direct evidence is needed to pin down their magnetic nature.

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the low temperature Fermi surface of FeSe as experimentally determined by ARPES consists of one ellipti-cal hole pocket and one orthogonally-oriented peanut-shaped electron pocket. ARPES Studies of Monolayer FeSe on MBE Controlled Titanate Heterostructures. For 2D films, interface interactions can play a critical role in determining the prevailing physics of the system. In the case of 1ML FeSe on SrTiO3, interfacial electron-phonon (e-ph) coupling greatly increases its superconducting Tc over its bulk counterpart.

Flera topologiska tillstånd i järnbaserade superledare - naturfysik

(a) The ARPES map of the high-symmetry cut through top of the Brillouin zone for the tetragonal phase of FeSe 1 − x S x (x = 0, 0.18, 1) at 56–69 eV, together with a calculated slice for FeS in (b). The solid line indicates the cuts used during ARPES experiments. 2015-07-15 · ARPES studies on the monolayer FeSe exhibit a superconducting gap with a size of 15 meV, corresponding to a T c ∼ 55 K , . Based on a series of ARPES measurements to investigate the effect of film thickness on the electron structure, Tan et al.

High-resolution ARPES study of FeSe superconductors 著者 PHAN Giao Ngoc number 82 学位授与機関 Tohoku University 学位授与番号理博第3147号 We report results on epitaxial FeSe thin films grown by pulsed laser deposition (PLD) on CaF2 (001) substrates as obtained by exploiting the advantages of an all-in-situ ultra-high vacuum (UHV) laboratory allowing for direct high-resolution surface analysis by scanning tunnelling microscopy (STM), synchrotron radiation X-ray photoelectron spectroscopy (XPS) and angle-resolved photoemission Nano-ARPES measurements were performed using the k microscope at the ANTARES beamline at the Soleil synchrotron, Paris, with a spot size of 100 nm. At a photon energy of 100 eV, this beamline has an angular resolution of ∼0.2 and an energy resolution of ∼10 meV. The advantage of the nano-ARPES technique for the study of ReS 2 is that (b) ARPES spectra taken along the Γ−M direction on a twinned FeSe. (c),(d) ARPES spectra taken on detwinned FeSe along the Γ−M X and Γ−M Y directions, respectively. (e),(f) EDCs taken at the momentum pointed to by arrows in (b)–(d). All measurements are taken with 70 eV photons under odd polarization with respect to the cut direction.
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(e),(f) EDCs taken at the momentum pointed to by arrows in (b)–(d). All measurements are taken with 70 eV photons under odd polarization with respect to the cut direction. Although ARPES measurements indicated a the distinct pseudogap-like reduction in DOS in the hole pocket above $T_{\text{c}}$, 116) no discernible reduction in DOS was observed in STS measurements. 142) The evolutions of the BCS–BEC crossover behavior in FeSe $_{1-x}$ S x again suggest that a multiband system exhibits a unique feature that is absent in a single-band system. Recently, in single layer FeSe films grown on SrTiO$_3$ substrate, signs for a new 65 K Tc record are reported.

142) The evolutions of the BCS–BEC crossover behavior in FeSe $_{1-x}$ S x again suggest that a multiband system exhibits a unique feature that is absent in a single-band system. Recently, in single layer FeSe films grown on SrTiO$_3$ substrate, signs for a new 65 K Tc record are reported. Combining molecular beam epitaxy and in situ angle resolved photoemission spectroscopy (ARPES), we study the ultra thin FeSe films on various substrates.
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This indicates remarkable complexity and new physics in the “overdoped” region. FeSe is a fascinating superconducting material at the frontier of research in condensed matter physics. Here, we provide an overview of the current understanding of the electronic structure of FeSe, focusing in particular on its low-energy electronic structure as determined from angle-resolved photoemission spectroscopy, quantum oscillations, and magnetotransport measurements of single-crystal in bulk FeSe samples [6]. In this wide temperature range, the system shows a marked electron nematicity in transport [7].

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The solid line indicates the cuts used during ARPES experiments. 2015-07-15 · ARPES studies on the monolayer FeSe exhibit a superconducting gap with a size of 15 meV, corresponding to a T c ∼ 55 K , . Based on a series of ARPES measurements to investigate the effect of film thickness on the electron structure, Tan et al.

Flera topologiska tillstånd i järnbaserade superledare - naturfysik

[37] found the FSs of the monolayer FeSe film and the multilayer FeSe film were significantly different ( Fig. 12 ).

2019. In this Nature paper, T. Shimojima (RIKEN CEMS) et al.